Navel Jelly works but most people don't have it handy and why spend the money when there's Coke in the fridge?

As for Coke damaging the club........a quick rinse and a good wipe and you don't have to worry about it, regardess of the condition of the club. I've been doing it for years and there's no sign of "acidic" damage to any of my clubs. Chrome or otherwise.